Largest urban population (as proportion of total)
Anguilla, Singapore, Cayman Islands, Sint Maarten, Nauru, Macau SAR, Hong Kong SAR, Gibraltar, Bermuda, Monaco, Holy See, Kuwait
100 percentage
Not Applicable ()

According to the United Nations' World Urbanization Prospects 2018, the record for the most urbanized country is shared by 12 nations, all of which are either tiny city-states or small islands and have a 100% urbanized population. The full list comprises Anguilla, Singapore, Cayman Islands, Sint Maarten (Netherlands), Nauru, Macau SAR (China), Monaco, Hong Kong SAR (China), Gibraltar, Kuwait, the Holy See (Vatican City), and Bermuda.

The largest countries (in terms of area) with an urbanization rate of more than 95% is Belgium (on 98%) followed by Uruguay (on 95%). As of 2018, some 4.219 billion people are living in cities worldwide, representing 55.3% of the world's total population.